Internal-combustion engine



7 ,1926. v -J.- H. wlLLsoN INTERNAL COMBUSTION NGINE File Now 19. 1921 particularly, the expansion j and rods pivotally connected to Patented Sept. 7,1926.

UNITED STATES V JOSEPH H. WILLSON, 0F PHILADELPHIA,

l 1,599,260 PATENT OFFICE.

EENNSYLVANIA, AssIGNonfBY MESNE As- SIGNMENTS, T0 FOX HOLDING COMPANY, OF PHILADELPHIA, PENNSYLVANIA,

A CORPORATION OF DELAWARE INTIB'NAL-GOIMI'BUSTION ENGINE.

Application led November mounted thereon, away from the push rods,

for actuatingthem, thereby increasing the amount of clearance between the two parts beyond that which they have when the engine is cold. Because of this, theengine, which is adjusted to run properly and quietly when cold, produces an objectionable noise when hot, when the rocker arm comes in contact with the valve stems in the act of opening the valve. In air-cooled engines that ,takes place has heretofore been accompanied by such separation between the rocker arms and the valve stems as to involve an inherent defect which 'is correctedby the present improvements. l

These improvements are characterized, in their preferred form, by the use of adjustable eccentric bearings for the rocker arms which act upon the stems of overhead valves,

said bearings whereby they are turned as thel cylinders expand under running -conditions so that the relations ofrthe arms to and their actions upon the stems are maintained sub stantially constant.

In the drawings, Fig. 1 is an elevation of the cylinder of an internalcombustion engine equipped with the improvements; Fig. 2 is an irregular sectional view taken vertically through the axis of the rocker arms and the connected parts, and Fig. 3 is a detached shaft having eccentric bearings for the rocker arms.

The invention, in the form thereof illustrated in the drawings, is applied to an engine cylinder 1 having the overhead valve stems 2 operated by respective rocker arms 3, the latter beingoscillated by the ush rods 4, through the action thereon o the cams 5 which revolve in the crank case 6.

19, 1921. Serial No. 516,262.

i' In accordance with this invention, a shaft 7 is provided with end journals 8, which are. engaged in the bearings 9 carried by the cyllnder; with the intermediate cylindrical bearings 10 eccentric to the journals and onl which the arms 3 are fulcrumed, and with the arms l1 ixed to the'journals for turning them in the bearings 9 and for turning the bearings 10 to elevate or lower the axis of the rocker arms.

Rods 12 are adjustably anchored at one end by the nuts 13 to the brackets 14 fixed to the crank case 6, and are pivotally con-y nected at the other end by the pins 15 to the arms 11. These connectin posed so that they are not a ected substantially or changed in length by temperature changes in the c linder due to the explosions therein. There ore, under operating conditions, the rods act in compensating relation to cause the desired movement of the -shaft 5 about its axis and the adjustment of the bearings 1.0 on which the rocker arms 3 are f-ulcrumed.

rods are disas the cylinder expands It will lbe understood that the `nuts 13 A are adjusted on the rods 12 (which act in compensating relation to each other) to set the shaft 5 in such position that whether the cylinder is cold or hot the heads 3 of the rocker arms 3 maintain constantly their desired close relation to the stems 2, the expansion and contraction of the cylinder moving the bearings 9 together with the journals 8 sothat the rods 12 act -through the arms 11 to turn the shaft 7 witha resulting adjustment! of the 'eccentric bearings 10 and the rocker arms- 3 as required to effect their desired action..

. Having described my invention, I claim 1. In an internal combustion engine, the combination with a valve stem and an actuating arm for the same, of means for automatically adjusting said actuating arm and securing a substantially constant operating relation thereof to said stem, said means comprising a bearing 'mounted on the engine cylinder,

nalled in said bearing and a rod connected with said fulcrum so as to turn it upon the an eccentric fulcrum jourbearing journalled relatively to s aid cylinder, a rocker arm mounted on said bearing for actuating said stem, and means comprising an anchored rod pivotally connected 'to of said cylinder.

,saideccentric bearings; rods pivotally con-` 3. In an internal combustion engine, in combination with the cylinder and the.' valve stem, of a shaft journalled relatively to said cylinder, said 'shaft provided with an arm and an eccentric bearing, a rocker arm mounted on said bearing for actuating said stem and an anchored rod ivotally connected to 'said arm, for adjusting said bear- 1n A In an internal' combustion engine, in combination With the cylinder provided with journal bearings, valve -mechanism comprising stems, and rocker arms having heads for actuating said stems; of a shaft having journals mounted in said bearings, eccentric bearings on Whichsaid arms are adapted to j rock, and arms for adjusting nected to said arms last named, and means for anchoring said rods. r i Vv5. In an internal combustion engine, the

combination with the cylinder, a bearing carried by said cylinder, arocker. arm, mechanism comprising a push rod for'rocking said arm, and valve mechanism compr1sing a stem actuated by said rocker arm, of a rocker arm shaft having a journal mounted in said'bearing, a bearin 'eccen,

mechanism, and automatic means for moving the vfulcrum of said rockshaftcounter to the movement of the head of said cylinder due to contraction` and expansion of said cylinder.

.7. In an internal combustion engine the combinationl with an expansible cylinder and valve mechanism carried thereby, of a rocker arm 'for operating said valve mechanism, a revoluble shaft having a surface ec-A centric to its axis ofrotation, said rocker arm being ulcrumed on said shaft, and an anchorage independent lof the expansion and contraction of said cylinder and connected with saidY shaft. so as to rotate the same upon the. expansionor contraction of said cylinder.

Signed at Pitman, in the county of Gloucester and State of New Jersey, this 12th' day of llovember, 1921. v

JOSEPH HVILLSON.' 

